I changed bulbs in my instrument cluster and subsequently fried my speedo and odometer. I've been told that I hooked up a wire that is for a tach (I have a clock) to the wrong prong and fried it. Does anyone know which wire goes where. There is a yellowish one and a reddish one. The two male parts on the cluster are right next to each other one on top of the other. Help!

I have an 89 245 DL. Depending on the year of your car, you may or may not have the same wiring scheme. If the info below doesn't help let me know what year you have and I will try to look your wiring diagram in my haynes manual.

I pulled my speedo this evening and this is what I found.

My speedometer/odometer wires appear to be together in one plastic connector. Wire colors are red, black, and blue. According to my Haynes manual red comes from the ignition switch, blue comes from the transmition and I am assuming black is the ground wire.

My Tach wires are red/white. (disconneted!!)

I have a yellow/red wire that plugs into the bottom corner of the cluster, (closest to the radio, ignition, etc). I believe this controls the "shift up" light.

All other wiring has custom connections that can only go one place on the cluster.

Hope this helps.

Charles Alspaugh II

I did the same thing. Cost me $150 to have the speedo fixed and I still don't think it reads the correct speed.

I will check it out tonight when I get home and let you know the correct wire / color combination. If possible I will take some digital pics and email them to you.

Charles Alspaugh II

Rice

I did take my speedo out last night. My car is a 87 245 with no tach, or cruise. The wire with the small connector was yellow & red. The one that hooks up to the double spade at the 2 to 3 o'clock position as your looking at front of gauge, is white and red. I have a blue wire that I beleive must be the tach wire as it has never been hooked to anything.

On my 87 (no tach)the size of the connectors is the key. As your sitting in the car looking at the face of the panel the one with the small connector (beleive yellow) goes to the bottom right hand corner. The other wire goes onto the larger spade that would be at approx. 3 o'clock as you look at the front of the speedo. The small connector will not fit on the larger spade. I beleive this may a double spade connector but it makes no difference which spade you plug into, only that you don't plug the tach wire into anything. Of course the three wire goofy "L" shaped connetor goes to the speedo circuit board. Wonder if your problem might be with this connector as it may not be connecting. It is a touchy s.o.b.

I need to take mine back out anyway and will do this tonight. I will look closer at wire colors and get back with you.

Thanks so much. But which one is the tach wire? There is the one wire that can fit only into the very bottom right hand corner and then there are two wires that can fit onto the male connector at the 3 o'clock position. Which one is tach?

I believe the one with red stripe is for the tach and yellow one is output to cruise control. I did same thing and it was the IC Chip on small PBA board with motor for odometer that got fried. I took one of another junkyard speedo assembly to repair mine. Some folks have these chips if you ask around. The tach wire is not plugged anywhere unless you have a tach. The dual prong on back of speedo is same connection, so cruise wire can go in either position.